Ferrohouse in Zurich, an example of futurist architecture Futurist architecture began as an early-20th century form of architecture characterized by anti-historicism and long horizontal lines suggesting speed, motion and urgency. Technology and even violence were among the themes of the Futurists. The movement was founded by the poet Filippo Tommaso Marinetti, who produced its first manifesto, the Manifesto of Futurism in 1909. The movement attracted not only poets, musicians, artist but also a number of architects. Among the latter there was Antonio Sant'Elia, who, though he built little, translated the Futurist vision into bold urban form.

What is the Expressionist architecture?

Goetheanum by Rudolf Steiner in 1923Expressionist architecture was an architectural movement that developed in Northern Europe during the first decades of the 20th century in parallel with the expressionist visual and performing arts.

The style was characterised by an early-modernist adoption of novel materials, formal innovation, and very unusual massing, sometimes inspired by natural biomorphic forms, sometimes by the new technical possibilities offered by the mass production of brick, steel and especially glass. Many expressionist architects fought

in World War I and their experiences, combined with the political turmoil and social upheaval that followed the German Revolution of 1919, resulted in a utopian outlook and a romantic socialist agenda. Economic conditions severely limited the number of built commissions between 1914 and the mid 1920s, resulting in many of the most important expressionist works remaining as projects on paper, such as Bruno Taut's Alpine Architecture and Hermann Finsterlin's Formspiels. Ephemeral exhibition buildings were numerous and highly significant during this period. Scenography for theatre and films provided another outlet for the expressionist imagination, and provided supplemental incomes for designers attempting to challenge conventions in a harsh economic climate.

Since 1963, a new structural system of framed tubes appeared in skyscraper design and construction. The Bangladeshi engineer Fazlur Khan defined the framed tube structure as "a three dimensional space structure composed of three, four, or possibly more frames, braced frames, or shear walls, joined at or near their edges to form a vertical tube-like structural system capable of

resisting lateral forces in any direction by cantilevering from the foundation."Closely spaced interconnected exterior columns form the tube. Horizontal loads, for example wind, are supported by the structure as a whole. About half the exterior surface is available for windows. Framed tubes allow fewer interior columns, and so create more usable floor space. Where larger openings like garage doors are required, the tube frame must be interrupted, with transfer girders used to maintain structural integrity.

The first building to apply the tube-frame construction was the DeWitt-Chestnut Apartment Building which Khan designed and was completed in Chicago by 1963. This laid the foundations for the tube structures of many other later skyscrapers, including his own John Hancock Center and Sears Tower, and can been seen in the construction of the World Trade Center, Petronas Towers, Jin Mao Building, and most other supertall skyscrapers since the 1960s. The architecture of Chicago employing the ideas developed by Khan is often known as the "Second Chicago School".

What is the postmodern architecture?

Kyoto Station.Postmodern architecture is an international style whose first examples are generally cited as being from the 1950s, and which continues to influence present-day architecture. Postmodernity in architecture is generally thought to be heralded by the return of "wit, ornament and reference" to architecture in response to the formalism of the International Style of modernism. As with many cultural movements, some of postmodernism's most pronounced and visible ideas can be seen in architecture. The functional and formalized shapes and spaces of the modernist movement are replaced by unapologetically diverse aesthetics: styles

collide, form is adopted for its own sake, and new ways of viewing familiar styles and space abound.

Classic examples of modern architecture are the Lever House and the Seagram Building in commercial space, and the architecture of Frank Lloyd Wright or the Bauhaus movement in private or communal spaces. Transitional examples of postmodern architecture are the Portland Building in Portland and the Sony Building in New York City, which borrows elements and references from the past and reintroduces color and symbolism to architecture.

The Seattle Space Needle, built for Seattle's World's Fair, 1962- an example of Googie architecture. Googie architecture is a subdivision of expressionist, or futurist architecture influenced by car culture the Space Age, originating from southern California in the late 1940s and continuing approximately into the mid-1960s. With upswept roofs and, often, curvaceous, geometric shapes, and bold use of glass, steel and neon, it decorated many a motel, coffee house and bowling alley in the 1950s and 1960s. It epitomizes the spirit a generation demanded, looking excitedly towards a bright, technological and futuristic age.

Libeskind's Imperial War Museum North in Manchester comprises three apparently intersecting curved volumes. Deconstructive in architecture is a development of postmodern architecture that began in the late 1980s. It is characterized by ideas of fragmentation, non-linear processes of design, an interest in manipulating ideas of a structure's surface or skin, and apparent non-Euclidean geometry, which serve to distort and dislocate some of the elements of architecture, such as structure and envelope. The finished visual appearance of buildings that exhibit the many deconstructive "styles" is characterized by a stimulating unpredictability and a controlled chaos.